I'm with you 110%. Disney is in no position to dick around with their Orlando parks anymore. Uni is stepping up to the challenge. Potter at IoA will definitely give WDW a run for its money. Even if Orlando visitors only spend one day at Uni during their Disney vacations, as you've pointed out, that's gonna hurt Mickey's money guys like a kick to the groin.
It's time for John Lasseter to sit down with Bruce and Craig and clear the accountaneering smog out of blue sky. Time to bring those "must ride" concepts out of mothballs and revitalize them for the 21st century.
Rides like Everest are a good start, but the ante just got upped. More elaborate and immersive experiences are needed. Absolutely.